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1 // Boost.Units - A C++ library for zero-overhead dimensional analysis and
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2 // unit/quantity manipulation and conversion
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3 //
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4 // Copyright (C) 2003-2008 Matthias Christian Schabel
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5 // Copyright (C) 2007-2008 Steven Watanabe
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6 //
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7 // Distributed under the Boost Software License, Version 1.0. (See
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8 // accompanying file LICENSE_1_0.txt or copy at
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9 // http://www.boost.org/LICENSE_1_0.txt)
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10
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11 #ifndef BOOST_UNITS_MAKE_SCALED_UNIT_HPP_INCLUDED
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12 #define BOOST_UNITS_MAKE_SCALED_UNIT_HPP_INCLUDED
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13
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14 #include <boost/units/units_fwd.hpp>
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15 #include <boost/units/heterogeneous_system.hpp>
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16 #include <boost/units/unit.hpp>
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17
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18 namespace boost {
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19 namespace units {
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20
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21 template<class Unit, class Scale>
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22 struct make_scaled_unit {
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23 typedef typename make_scaled_unit<typename reduce_unit<Unit>::type, Scale>::type type;
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24 };
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25
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26 template<class Dimension, class UnitList, class OldScale, class Scale>
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27 struct make_scaled_unit<unit<Dimension, heterogeneous_system<heterogeneous_system_impl<UnitList, Dimension, OldScale> > >, Scale> {
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28 typedef unit<
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29 Dimension,
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30 heterogeneous_system<
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31 heterogeneous_system_impl<
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32 UnitList,
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33 Dimension,
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34 typename mpl::times<
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35 OldScale,
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36 list<scale_list_dim<Scale>, dimensionless_type>
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37 >::type
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38 >
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39 >
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40 > type;
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41 };
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42
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43 template<class Dimension, class UnitList, class OldScale, long Base>
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44 struct make_scaled_unit<unit<Dimension, heterogeneous_system<heterogeneous_system_impl<UnitList, Dimension, OldScale> > >, scale<Base, static_rational<0> > > {
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45 typedef unit<
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46 Dimension,
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47 heterogeneous_system<
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48 heterogeneous_system_impl<
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49 UnitList,
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50 Dimension,
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51 OldScale
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52 >
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53 >
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54 > type;
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55 };
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56
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57 }
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58 }
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59
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60 #endif
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